NASA science project to keep tab on twins

August 6, 2013 6:14 AM

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NASA science project to keep tab on twins

Scott and Mark Kelly volunteered for study of space effects on orbiting brother.

CAPE CANAVERAL, Fla. -- Twin astronauts will serve as test subjects for human spaceflight experiments when one of the brothers flies a yearlong expedition on the International Space Station while the other remains on Earth.

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